My delete key is backspacing - erasing characters to its left
Not sure what I've done but my delete key is not working properly. It is erasing characters to its right instead of characters to its left like it usually would. Additionally my left and right arrows are skipping to the end of the line or word instead of to the next character. The screenshot functions on my computer are also not working . not sure if its related. the actual keys are completely fine, words/letters will delete if I highlight them or click the cursor in front of the letter. Thanks in advance :)
MacBook Air 13", OS X 10.10